Of course businesses like Blue City couldn't operate with no freighters, which is why I said obviously not down to zero!
However for ad-hoc cargo business, mostly at night, peak business being October - April, being closed at night for most of that time a big loss, indeed know that businesses like Blue City nearly didn't survive during that time.
Think there were around 170 ad-hoc cargo movements in October 2013 before the closures, by March 2014 it was down to around 10.